- 1. [Amps] Instability update, Apr 16 (score: 1)
- Author: N1BUG <paul@n1bug.com>
- Date: Tue, 16 Apr 2013 22:23:52 -0400
- Today I did three things: 1.) Added a safety choke to ground on output side of pi network. Of course it should have been there all along. 2.) Added a .01 uF cap across the filament pins. 3.) Upgraded
- /archives//html/Amps/2013-04/msg00135.html (8,028 bytes)
- 2. Re: [Amps] Instability update, Apr 16 (score: 1)
- Author: Bill Turner <dezrat1242@yahoo.com>
- Date: Tue, 16 Apr 2013 20:38:45 -0700
- REPLY: Your tube may be oscillating as an old fashioned TPTG (Tuned Plate Tuned Grid) oscillator. Something in the plate circuit is present a large impedance at LF. Do you have a relatively large cho
- /archives//html/Amps/2013-04/msg00138.html (8,022 bytes)
- 3. Re: [Amps] Instability update, Apr 16 (score: 1)
- Author: N1BUG <paul@n1bug.com>
- Date: Wed, 17 Apr 2013 08:37:39 -0400
- I will no doubt say at least one incorrect/stupid thing in my response to Bill. I trust and hope someone will point it out so I can learn from it! That is my present theory, based partly on the fact
- /archives//html/Amps/2013-04/msg00156.html (12,158 bytes)
- 4. Re: [Amps] Instability update, Apr 16 (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Wed, 17 Apr 2013 10:16:57 -0400
- I dont know if this has been covered yet but what does the socket contacts and tube tabs look like? If you have a lot of silver sulphide the screen might be partially bloating. I use Tarn-X and a Q-T
- /archives//html/Amps/2013-04/msg00158.html (10,138 bytes)
- 5. Re: [Amps] Instability update, Apr 16 (score: 1)
- Author: N1BUG <paul@n1bug.com>
- Date: Wed, 17 Apr 2013 13:12:53 -0400
- Tube ceramic looks OK, no sign of arcs. Some discoloration/dirt typical of a tube that has been in service more than 10 years but nothing that looks like it would cause trouble. Tube tabs have no vis
- /archives//html/Amps/2013-04/msg00162.html (9,120 bytes)
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